Air heater



FIG. 1 is a left side view of an air heater showing our new design.

FIG. 2 is a right side view of the air heater of FIG. 1.

FIG. 3 is a top view of the air heater of FIG. 1.

FIG. 4 is a front perspective view of the air heater of FIG. 1.

FIG. 5 is a rear view of the air heater of FIG. 1.

FIG. 6 is a front view of the air heater of FIG. 1; and,

FIG. 7 is a rear perspective view of the air heater of FIG. 1. 

The ornamental design for an air heater, as shown and described. 